refactor: ClareCourseWare 教师专用 - 移除所有学生界面，登录后直接显示 TeacherDashboard；简化 App.tsx 为教师专用版本

web/src/App.tsx

@@ -1,192 +1,17 @@
-// web/src/App.tsx
-import React, { useState, useEffect, useRef, useMemo } from "react";
-import { Header } from "./components/Header";
-import { ChatArea } from "./components/ChatArea";
+// web/src/App.tsx - 教师专用版本（ClareCourseWare）
+import React, { useState, useEffect } from "react";
 import { LoginScreen } from "./components/LoginScreen";
-import { ProfileEditor } from "./components/ProfileEditor";
-import { ReviewBanner } from "./components/ReviewBanner";
-import { Onboarding } from "./components/Onboarding";
-import { X, ChevronLeft, ChevronRight } from "lucide-react";
-import { Button } from "./components/ui/button";
-import { Toaster } from "./components/ui/sonner";
-import { toast } from "sonner";
-import { LeftSidebar } from "./components/sidebar/LeftSidebar";
 import { TeacherDashboard } from "./components/TeacherDashboard";
-
-// backend API bindings
-import { apiChat, apiUpload, apiMemoryline, apiQuizStart } from "./lib/api";
-
-// NEW: review-star logic
-import {
-  type ReviewStarState,
-  type ReviewEventType,
-  markReviewActive,
-  normalizeToday,
-  starOpacity,
-  energyPct,
-} from "./lib/reviewStar";
-
-
-export type MessageAttachmentKind = "pdf" | "ppt" | "doc" | "image" | "other";
-
-export interface MessageAttachment {
-  name: string;
-  kind: MessageAttachmentKind;
-  size: number;
-  // 这两个只是展示用，不影响后端
-  fileType?: FileType; // syllabus / lecture-slides / ...
-}
-
-export interface Message {
-  id: string;
-  role: "user" | "assistant";
-  content: string;
-  timestamp: Date;
-  references?: string[];
-  sender?: GroupMember;
-  showNextButton?: boolean;
-
-  // ✅ NEW: show files “with” the user message (metadata only)
-  attachments?: MessageAttachment[];
-
-  questionData?: {
-    type: "multiple-choice" | "fill-in-blank" | "open-ended";
-    question: string;
-    options?: string[];
-    correctAnswer: string;
-    explanation: string;
-    sampleAnswer?: string;
-  };
-}
-
-
+import { Toaster } from "./components/ui/sonner";
 
 export interface User {
-  // required identity
   name: string;
   email: string;
-
-  // profile fields
-  studentId?: string;
-  department?: string;
-  yearLevel?: string;
-  major?: string;
-  bio?: string; // may be generated by Clare, then user can edit in ProfileEditor
-
-  // learning preferences
-  learningStyle?: string; // "visual" | "auditory" | ...
-  learningPace?: string; // "slow" | "moderate" | "fast"
-
-  // avatar
-  avatarUrl?: string;
-
-  // control flags
-  onboardingCompleted?: boolean;
-}
-
-export interface GroupMember {
-  id: string;
-  name: string;
-  email: string;
-  avatar?: string;
-  isAI?: boolean;
-}
-
-export type SpaceType = "individual" | "group";
-
-export interface CourseInfo {
-  id: string;
-  name: string;
-  instructor: { name: string; email: string };
-  teachingAssistant: { name: string; email: string };
-  teachingAssistants?: { name: string; email: string }[];
-}
-
-export interface Workspace {
-  id: string;
-  name: string;
-  type: SpaceType;
-  avatar: string;
-  members?: GroupMember[];
-  category?: "course" | "personal";
-  courseName?: string;
-  courseInfo?: CourseInfo;
-  isEditable?: boolean;
-}
-
-export type FileType = "syllabus" | "lecture-slides" | "literature-review" | "other";
-
-export interface UploadedFile {
-  file: File;
-  type: FileType;
-}
-
-export type LearningMode = "general" | "concept" | "socratic" | "exam" | "assignment" | "summary";
-export type Language = "auto" | "en" | "zh";
-export type ChatMode = "ask" | "review" | "quiz";
-
-export interface SavedItem {
-  id: string;
-  title: string;
-  content: string;
-  type: "export" | "quiz" | "summary";
-  timestamp: Date;
-  isSaved: boolean;
-  format?: "pdf" | "text";
-  workspaceId: string;
-}
-
-export interface SavedChat {
-  id: string;
-  title: string;
-  messages: Message[];
-  chatMode: ChatMode;
-  timestamp: Date;
-}
-
-const DOC_TYPE_MAP: Record<FileType, string> = {
-  syllabus: "Syllabus",
-  "lecture-slides": "Lecture Slides / PPT",
-  "literature-review": "Literature Review / Paper",
-  other: "Other Course Document",
-};
-
-function mapLanguagePref(lang: Language): string {
-  if (lang === "zh") return "中文";
-  if (lang === "en") return "English";
-  return "Auto";
-}
-
-// ✅ localStorage helpers for saved chats
-function savedChatsStorageKey(email: string) {
-  return `saved_chats::${email}`;
-}
-
-function hydrateSavedChats(raw: any): SavedChat[] {
-  if (!Array.isArray(raw)) return [];
-  return raw
-    .map((c: any) => {
-      try {
-        return {
-          ...c,
-          timestamp: c?.timestamp ? new Date(c.timestamp) : new Date(),
-          messages: Array.isArray(c?.messages)
-            ? c.messages.map((m: any) => ({
-                ...m,
-                timestamp: m?.timestamp ? new Date(m.timestamp) : new Date(),
-              }))
-            : [],
-        } as SavedChat;
-      } catch {
-        return null;
-      }
-    })
-    .filter(Boolean) as SavedChat[];
 }
 
 // ✅ localStorage helpers for user profile
 function profileStorageKey(email: string) {
-  return `user_profile::${email}`;
+  return `teacher_profile::${email}`;
 }
 
 function hydrateUserFromStorage(base: User): User {
@@ -201,29 +26,8 @@ function hydrateUserFromStorage(base: User): User {
 }
 
 function App() {
-  const [isDarkMode, setIsDarkMode] = useState(() => {
-    const saved = localStorage.getItem("theme");
-    return saved === "dark" || (!saved && window.matchMedia("(prefers-color-scheme: dark)").matches);
-  });
-
   const [user, setUser] = useState<User | null>(null);
 
-  // ✅ unified user update helpers
-  const updateUser = (patch: Partial<User>) => {
-    setUser((prev) => (prev ? { ...prev, ...patch } : prev));
-  };
-
-  const handleUserSave = (next: User) => {
-    setUser((prev) => {
-      if (!prev) return next;
-      return {
-        ...prev,
-        ...next,
-        onboardingCompleted: next.onboardingCompleted ?? prev.onboardingCompleted,
-      };
-    });
-  };
-
   // ✅ persist user profile whenever it changes (per-email)
   useEffect(() => {
     if (!user?.email) return;
@@ -234,1322 +38,19 @@ function App() {
     }
   }, [user]);
 
-  // -------------------------
-  // ✅ Course selection (stable)
-  // -------------------------
-  const MYSPACE_COURSE_KEY = "myspace_selected_course";
-
-  const [currentCourseId, setCurrentCourseId] = useState<string>(() => {
-    return localStorage.getItem(MYSPACE_COURSE_KEY) || "course1";
-  });
-
-  const availableCourses: CourseInfo[] = [
-    {
-      id: "ist345",
-      name: "IST345",
-      instructor: { name: "Yan Li", email: "Yan.Li@cgu.edu" },
-      teachingAssistant: { name: "Kaijie Yu", email: "Kaijie.Yu@cgu.edu" },
-      teachingAssistants: [
-        { name: "Kaijie Yu", email: "Kaijie.Yu@cgu.edu" },
-        { name: "Yongjia Sun", email: "Yongjia.Sun@cgu.edu" },
-      ],
-    },
-    {
-      id: "course1",
-      name: "Introduction to AI",
-      instructor: { name: "Dr. Sarah Johnson", email: "sarah.johnson@university.edu" },
-      teachingAssistant: { name: "Michael Chen", email: "michael.chen@university.edu" },
-    },
-    {
-      id: "course2",
-      name: "Machine Learning",
-      instructor: { name: "Prof. David Lee", email: "david.lee@university.edu" },
-      teachingAssistant: { name: "Emily Zhang", email: "emily.zhang@university.edu" },
-    },
-    {
-      id: "course3",
-      name: "Data Structures",
-      instructor: { name: "Dr. Robert Smith", email: "robert.smith@university.edu" },
-      teachingAssistant: { name: "Lisa Wang", email: "lisa.wang@university.edu" },
-    },
-    {
-      id: "course4",
-      name: "Web Development",
-      instructor: { name: "Prof. Maria Garcia", email: "maria.garcia@university.edu" },
-      teachingAssistant: { name: "James Brown", email: "james.brown@university.edu" },
-    },
-  ];
-
-  const [askMessages, setAskMessages] = useState<Message[]>([
-    {
-      id: "1",
-      role: "assistant",
-      content:
-        "👋 Hi! I'm Clare, your AI teaching assistant. I'm here to help you learn through personalized tutoring. Feel free to ask me anything about the course materials, or upload your documents to get started!",
-      timestamp: new Date(),
-    },
-  ]);
-
-  const [reviewMessages, setReviewMessages] = useState<Message[]>([
-    {
-      id: "review-1",
-      role: "assistant",
-      content:
-        "📚 Welcome to Review mode! I'll help you review and consolidate your learning. Let's go through what you've learned!",
-      timestamp: new Date(),
-    },
-  ]);
-
-  const [quizMessages, setQuizMessages] = useState<Message[]>([
-    {
-      id: "quiz-1",
-      role: "assistant",
-      content:
-        "🎯 Welcome to Quiz mode! I'll test your understanding with personalized questions based on your learning history. Ready to start?",
-      timestamp: new Date(),
-    },
-  ]);
-
-  const [learningMode, setLearningMode] = useState<LearningMode>("concept");
-  const [language, setLanguage] = useState<Language>("auto");
-  const [chatMode, setChatMode] = useState<ChatMode>("ask");
-
-  const messages = chatMode === "ask" ? askMessages : chatMode === "review" ? reviewMessages : quizMessages;
-
-  const prevChatModeRef = useRef<ChatMode>(chatMode);
-
-  useEffect(() => {
-    let currentMessages: Message[];
-    let setCurrentMessages: (messages: Message[]) => void;
-
-    if (chatMode === "ask") {
-      currentMessages = askMessages;
-      setCurrentMessages = setAskMessages;
-    } else if (chatMode === "review") {
-      currentMessages = reviewMessages;
-      setCurrentMessages = setReviewMessages;
-    } else {
-      currentMessages = quizMessages;
-      setCurrentMessages = setQuizMessages;
-    }
-
-    const hasUserMessages = currentMessages.some((msg) => msg.role === "user");
-    const expectedWelcomeId = chatMode === "ask" ? "1" : chatMode === "review" ? "review-1" : "quiz-1";
-    const hasWelcomeMessage = currentMessages.some((msg) => msg.id === expectedWelcomeId && msg.role === "assistant");
-    const modeChanged = prevChatModeRef.current !== chatMode;
-
-    if ((modeChanged || currentMessages.length === 0 || !hasWelcomeMessage) && !hasUserMessages) {
-      const initialMessages: Record<ChatMode, Message[]> = {
-        ask: [
-          {
-            id: "1",
-            role: "assistant",
-            content:
-              "👋 Hi! I'm Clare, your AI teaching assistant. I'm here to help you learn through personalized tutoring. Feel free to ask me anything about the course materials, or upload your documents to get started!",
-            timestamp: new Date(),
-          },
-        ],
-        review: [
-          {
-            id: "review-1",
-            role: "assistant",
-            content:
-              "📚 Welcome to Review mode! I'll help you review and consolidate your learning. Let's go through what you've learned!",
-            timestamp: new Date(),
-          },
-        ],
-        quiz: [
-          {
-            id: "quiz-1",
-            role: "assistant",
-            content:
-              "🎯 Welcome to Quiz mode! I'll test your understanding with personalized questions based on your learning history. Ready to start?",
-            timestamp: new Date(),
-          },
-        ],
-      };
-
-      setCurrentMessages(initialMessages[chatMode]);
-    }
-
-    prevChatModeRef.current = chatMode;
-  }, [chatMode, askMessages.length, reviewMessages.length, quizMessages.length]);
-
-  const [uploadedFiles, setUploadedFiles] = useState<UploadedFile[]>([]);
-  const [memoryProgress, setMemoryProgress] = useState(36);
-
-  const [quizState, setQuizState] = useState<{
-    currentQuestion: number;
-    waitingForAnswer: boolean;
-    showNextButton: boolean;
-  }>({
-    currentQuestion: 0,
-    waitingForAnswer: false,
-    showNextButton: false,
-  });
-
-  const [isTyping, setIsTyping] = useState(false);
-  const [leftSidebarOpen, setLeftSidebarOpen] = useState(false);
-  const [showTeacherDashboard, setShowTeacherDashboard] = useState(false);
-  const [leftPanelVisible, setLeftPanelVisible] = useState(true);
-  const [showProfileEditor, setShowProfileEditor] = useState(false);
-  const [showOnboarding, setShowOnboarding] = useState(false);
-
-  const [showReviewBanner, setShowReviewBanner] = useState(() => true);
-  const [showClearDialog, setShowClearDialog] = useState(false);
-
-  const [savedItems, setSavedItems] = useState<SavedItem[]>([]);
-  const [recentlySavedId, setRecentlySavedId] = useState<string | null>(null);
-
-  const [savedChats, setSavedChats] = useState<SavedChat[]>([]);
-
-  // ✅ load saved chats after login
-  useEffect(() => {
-    if (!user?.email) return;
-    try {
-      const raw = localStorage.getItem(savedChatsStorageKey(user.email));
-      if (!raw) {
-        setSavedChats([]);
-        return;
-      }
-      const parsed = JSON.parse(raw);
-      setSavedChats(hydrateSavedChats(parsed));
-    } catch {
-      setSavedChats([]);
-    }
-  }, [user?.email]);
-
-  // ✅ persist saved chats whenever changed
-  useEffect(() => {
-    if (!user?.email) return;
-    try {
-      localStorage.setItem(savedChatsStorageKey(user.email), JSON.stringify(savedChats));
-    } catch {
-      // ignore
-    }
-  }, [savedChats, user?.email]);
-
-  const [groupMembers] = useState<GroupMember[]>([
-    { id: "clare", name: "Clare AI", email: "clare@ai.assistant", isAI: true },
-    { id: "1", name: "Sarah Johnson", email: "sarah.j@university.edu" },
-    { id: "2", name: "Michael Chen", email: "michael.c@university.edu" },
-    { id: "3", name: "Emma Williams", email: "emma.w@university.edu" },
-  ]);
-
-  const [workspaces, setWorkspaces] = useState<Workspace[]>([]);
-  const [currentWorkspaceId, setCurrentWorkspaceId] = useState<string>("individual");
-
-  // ✅ used to prevent duplicate upload per file fingerprint
-  const uploadedFingerprintsRef = useRef<Set<string>>(new Set());
-
-  useEffect(() => {
-    if (user) {
-      const userAvatar = `https://api.dicebear.com/7.x/avataaars/svg?seed=${encodeURIComponent(user.email)}`;
-      const course1Info = availableCourses.find((c) => c.id === "course1");
-      const course2Info = availableCourses.find((c) => c.name === "AI Ethics"); // may be undefined, that's OK
-
-      setWorkspaces([
-        { id: "individual", name: "My Space", type: "individual", avatar: userAvatar },
-        {
-          id: "group-1",
-          name: "CS 101 Study Group",
-          type: "group",
-          avatar: "https://api.dicebear.com/7.x/shapes/svg?seed=cs101group",
-          members: groupMembers,
-          category: "course",
-          courseName: course1Info?.name || "CS 101",
-          courseInfo: course1Info,
-        },
-        {
-          id: "group-2",
-          name: "AI Ethics Team",
-          type: "group",
-          avatar: "https://api.dicebear.com/7.x/shapes/svg?seed=aiethicsteam",
-          members: groupMembers,
-          category: "course",
-          courseName: course2Info?.name || "AI Ethics",
-          courseInfo: course2Info,
-        },
-      ]);
-    }
-  }, [user, groupMembers, availableCourses]);
-
-  const fallbackWorkspace: Workspace = {
-    id: "individual",
-    name: "My Space",
-    type: "individual",
-    avatar: user ? `https://api.dicebear.com/7.x/avataaars/svg?seed=${encodeURIComponent(user.email)}` : "",
-  };
-
-  const currentWorkspace: Workspace =
-    workspaces.find((w) => w.id === currentWorkspaceId) || workspaces[0] || fallbackWorkspace;
-
-  const spaceType: SpaceType = currentWorkspace?.type || "individual";
-
-  // =========================
-  // ✅ Scheme 1: "My Space" uses Group-like sidebar view model
-  // =========================
-  const mySpaceCourseInfo = useMemo(() => {
-    return availableCourses.find((c) => c.id === currentCourseId);
-  }, [availableCourses, currentCourseId]);
-
-  const mySpaceUserMember: GroupMember | null = useMemo(() => {
-    if (!user) return null;
-    return {
-      id: user.email,
-      name: user.name,
-      email: user.email,
-      avatar: `https://api.dicebear.com/7.x/avataaars/svg?seed=${encodeURIComponent(user.email)}`,
-    };
-  }, [user]);
-
-  const clareMember: GroupMember = useMemo(
-    () => ({ id: "clare", name: "Clare AI", email: "clare@ai.assistant", isAI: true }),
-    []
-  );
-
-  const sidebarWorkspaces: Workspace[] = useMemo(() => {
-    if (!workspaces?.length) return workspaces;
-    if (!mySpaceUserMember) return workspaces;
-
-    return workspaces.map((w) => {
-      if (w.id !== "individual") return w;
-
-      return {
-        ...w,
-        category: "course",
-        courseName: mySpaceCourseInfo?.name || w.courseName || "My Course",
-        courseInfo: mySpaceCourseInfo,
-        members: [clareMember, mySpaceUserMember],
-      };
-    });
-  }, [workspaces, mySpaceCourseInfo, mySpaceUserMember, clareMember]);
-
-  const sidebarSpaceType: SpaceType = useMemo(() => {
-    return currentWorkspaceId === "individual" ? "group" : spaceType;
-  }, [currentWorkspaceId, spaceType]);
-
-  const sidebarGroupMembers: GroupMember[] = useMemo(() => {
-    if (currentWorkspaceId === "individual" && mySpaceUserMember) {
-      return [clareMember, mySpaceUserMember];
-    }
-    return groupMembers;
-  }, [currentWorkspaceId, mySpaceUserMember, clareMember, groupMembers]);
-
-  // =========================
-  // ✅ Stable course switching logic
-  // =========================
-  const didHydrateMySpaceRef = useRef(false);
-
-  const handleCourseChange = (nextCourseId: string) => {
-    if (!nextCourseId) return;
-
-    if (currentWorkspace.type === "group" && currentWorkspace.category === "course") {
-      return;
-    }
-
-    setCurrentCourseId(nextCourseId);
-    try {
-      localStorage.setItem(MYSPACE_COURSE_KEY, nextCourseId);
-    } catch {
-      // ignore
-    }
-  };
-
-  useEffect(() => {
-    if (!currentWorkspace) return;
-
-    if (currentWorkspace.type === "group" && currentWorkspace.category === "course") {
-      const cid = currentWorkspace.courseInfo?.id;
-      if (cid && cid !== currentCourseId) setCurrentCourseId(cid);
-      didHydrateMySpaceRef.current = false;
-      return;
-    }
-
-    if (currentWorkspace.type === "individual") {
-      if (!didHydrateMySpaceRef.current) {
-        didHydrateMySpaceRef.current = true;
-
-        const saved = localStorage.getItem(MYSPACE_COURSE_KEY);
-        const valid = saved && availableCourses.some((c) => c.id === saved) ? saved : undefined;
-
-        const next = valid || currentCourseId || "course1";
-        if (next !== currentCourseId) setCurrentCourseId(next);
-      }
-    }
-  }, [
-    currentWorkspaceId,
-    currentWorkspace?.type,
-    currentWorkspace?.category,
-    currentWorkspace?.courseInfo?.id,
-    availableCourses,
-    currentCourseId,
-    currentWorkspace,
-  ]);
-
-  useEffect(() => {
-    if (currentWorkspace?.type !== "individual") return;
-    try {
-      const prev = localStorage.getItem(MYSPACE_COURSE_KEY);
-      if (prev !== currentCourseId) localStorage.setItem(MYSPACE_COURSE_KEY, currentCourseId);
-    } catch {
-      // ignore
-    }
-  }, [currentCourseId, currentWorkspace?.type]);
-
-  useEffect(() => {
-    document.documentElement.classList.toggle("dark", isDarkMode);
-    localStorage.setItem("theme", isDarkMode ? "dark" : "light");
-  }, [isDarkMode]);
-
-  useEffect(() => {
-    const prev = document.body.style.overflow;
-    document.body.style.overflow = "hidden";
-    return () => {
-      document.body.style.overflow = prev;
-    };
-  }, []);
-
-  useEffect(() => {
-    if (!user) return;
-
-    (async () => {
-      try {
-        const r = await apiMemoryline(user.email);
-        const pct = Math.round((r.progress_pct ?? 0) * 100);
-        setMemoryProgress(pct);
-      } catch {
-        // silent
-      }
-    })();
-  }, [user]);
-
-  // =========================
-  // ✅ Review Star (按天) state
-  // =========================
-  const reviewStarKey = useMemo(() => {
-    if (!user) return "";
-    return `review_star::${user.email}::${currentWorkspaceId}`;
-  }, [user, currentWorkspaceId]);
-
-  const [reviewStarState, setReviewStarState] = useState<ReviewStarState | null>(null);
-
-  useEffect(() => {
-    if (!user || !reviewStarKey) return;
-    if (chatMode !== "review") return;
-
-    const next = normalizeToday(reviewStarKey);
-    setReviewStarState(next);
-  }, [chatMode, reviewStarKey, user]);
-
-  const handleReviewActivity = (event: ReviewEventType) => {
-    if (!user || !reviewStarKey) return;
-    const next = markReviewActive(reviewStarKey, event);
-    setReviewStarState(next);
-  };
-
-  const reviewStarOpacity = starOpacity(reviewStarState);
-  const reviewEnergyPct = energyPct(reviewStarState);
-
-  const getCurrentDocTypeForChat = (): string => {
-    if (uploadedFiles.length > 0) {
-      const last = uploadedFiles[uploadedFiles.length - 1];
-      return DOC_TYPE_MAP[last.type] || "Syllabus";
-    }
-    return "Syllabus";
-  };
-
-  const handleSendMessage = async (content: string) => {
-    if (!user) return;
-
-    const hasText = !!content.trim();
-    const hasFiles = uploadedFiles.length > 0;
-
-    if (!hasText && !hasFiles) return;
-
-    const fileNames = hasFiles ? uploadedFiles.map((f) => f.file.name) : [];
-    const fileLine = fileNames.length ? `Uploaded files: ${fileNames.join(", ")}` : "";
-
-    const effectiveContent = hasText
-      ? content
-      : `I've uploaded file(s). Please read them and help me based on their content.\n${fileLine}`.trim();
-
-    const sender: GroupMember = {
-      id: user.email,
-      name: user.name,
-      email: user.email,
-      avatar: `https://api.dicebear.com/7.x/avataaars/svg?seed=${encodeURIComponent(user.email)}`,
-    };
-
-    const userVisibleContent = hasText
-      ? content
-      : `📎 Sent ${fileNames.length} file(s)\n${fileNames.map((n) => `- ${n}`).join("\n")}`;
-
-    // ✅ snapshot attachments at send-time 
-    const attachmentsSnapshot: MessageAttachment[] =
-      uploadedFiles.map((uf) => {
-        const lower = uf.file.name.toLowerCase();
-        const kind: MessageAttachmentKind =
-          lower.endsWith(".pdf")
-            ? "pdf"
-            : lower.endsWith(".ppt") || lower.endsWith(".pptx")
-            ? "ppt"
-            : lower.endsWith(".doc") || lower.endsWith(".docx")
-            ? "doc"
-            : [".jpg", ".jpeg", ".png", ".gif", ".webp"].some((e) => lower.endsWith(e))
-            ? "image"
-            : "other";
-    
-        return {
-          name: uf.file.name,
-          size: uf.file.size,
-          kind,
-          fileType: uf.type,
-        };
-      });
-    
-    const userMessage: Message = {
-      id: Date.now().toString(),
-      role: "user",
-      content: userVisibleContent,
-      timestamp: new Date(),
-      sender,
-      attachments: attachmentsSnapshot.length ? attachmentsSnapshot : undefined,
-    };
-
-    if (chatMode === "ask") setAskMessages((prev) => [...prev, userMessage]);
-    else if (chatMode === "review") setReviewMessages((prev) => [...prev, userMessage]);
-    else setQuizMessages((prev) => [...prev, userMessage]);
-
-    if (chatMode === "quiz") {
-      setIsTyping(true);
-
-      try {
-        const docType = getCurrentDocTypeForChat();
-
-        const r = await apiChat({
-          user_id: user.email,
-          message: effectiveContent,
-          learning_mode: "quiz",
-          language_preference: mapLanguagePref(language),
-          doc_type: docType,
-        });
-
-        const normalizeRefs = (raw: any): string[] => {
-          const arr = Array.isArray(raw) ? raw : [];
-          return arr
-            .map((x) => {
-              if (typeof x === "string") {
-                const s = x.trim();
-                return s ? s : null;
-              }
-              const a = x?.source_file ? String(x.source_file) : "";
-              const b = x?.section ? String(x.section) : "";
-              const s = `${a}${a && b ? " — " : ""}${b}`.trim();
-              return s || null;
-            })
-            .filter(Boolean) as string[];
-        };
-
-        const refs = normalizeRefs((r as any).refs ?? (r as any).references);
-
-        const assistantMessage: Message = {
-          id: (Date.now() + 1).toString(),
-          role: "assistant",
-          content: r.reply || "",
-          timestamp: new Date(),
-          references: refs.length ? refs : undefined,
-          sender: spaceType === "group" ? groupMembers.find((m) => m.isAI) : undefined,
-          showNextButton: false,
-        };
-
-        setIsTyping(false);
-
-        setTimeout(() => {
-          setQuizMessages((prev) => [...prev, assistantMessage]);
-          setQuizState((prev) => ({ ...prev, waitingForAnswer: true, showNextButton: false }));
-        }, 50);
-      } catch (e: any) {
-        setIsTyping(false);
-        toast.error(e?.message || "Quiz failed");
-
-        const assistantMessage: Message = {
-          id: (Date.now() + 1).toString(),
-          role: "assistant",
-          content: "Sorry — quiz request failed. Please try again.",
-          timestamp: new Date(),
-          sender: spaceType === "group" ? groupMembers.find((m) => m.isAI) : undefined,
-        };
-
-        setTimeout(() => {
-          setQuizMessages((prev) => [...prev, assistantMessage]);
-        }, 50);
-      }
-
-      return;
-    }
-
-    setIsTyping(true);
-    try {
-      const docType = getCurrentDocTypeForChat();
-
-      const r = await apiChat({
-        user_id: user.email,
-        message: effectiveContent,
-        learning_mode: learningMode,
-        language_preference: mapLanguagePref(language),
-        doc_type: docType,
-      });
-
-      const refs = (r.refs || [])
-        .map((x: any) => {
-          const a = x?.source_file ? String(x.source_file) : "";
-          const b = x?.section ? String(x.section) : "";
-          const s = `${a}${a && b ? " — " : ""}${b}`.trim();
-          return s || null;
-        })
-        .filter(Boolean) as string[];
-
-      const assistantMessage: Message = {
-        id: (Date.now() + 1).toString(),
-        role: "assistant",
-        content: r.reply || "",
-        timestamp: new Date(),
-        references: refs.length ? refs : undefined,
-        sender: spaceType === "group" ? groupMembers.find((m) => m.isAI) : undefined,
-      };
-
-      setIsTyping(false);
-
-      setTimeout(() => {
-        if (chatMode === "ask") setAskMessages((prev) => [...prev, assistantMessage]);
-        else if (chatMode === "review") setReviewMessages((prev) => [...prev, assistantMessage]);
-      }, 50);
-
-      try {
-        const ml = await apiMemoryline(user.email);
-        setMemoryProgress(Math.round((ml.progress_pct ?? 0) * 100));
-      } catch {
-        // ignore
-      }
-    } catch (e: any) {
-      setIsTyping(false);
-      toast.error(e?.message || "Chat failed");
-
-      const assistantMessage: Message = {
-        id: (Date.now() + 1).toString(),
-        role: "assistant",
-        content: "Sorry — chat request failed. Please try again.",
-        timestamp: new Date(),
-        sender: spaceType === "group" ? groupMembers.find((m) => m.isAI) : undefined,
-      };
-
-      setTimeout(() => {
-        if (chatMode === "ask") setAskMessages((prev) => [...prev, assistantMessage]);
-        if (chatMode === "review") setReviewMessages((prev) => [...prev, assistantMessage]);
-      }, 50);
-    }
-  };
-
-  const handleNextQuestion = async () => {
-    if (!user) return;
-
-    const prompt = "Please give me another question of the same quiz style.";
-    const sender: GroupMember = {
-      id: user.email,
-      name: user.name,
-      email: user.email,
-      avatar: `https://api.dicebear.com/7.x/avataaars/svg?seed=${encodeURIComponent(user.email)}`,
-    };
-
-    const userMessage: Message = {
-      id: Date.now().toString(),
-      role: "user",
-      content: prompt,
-      timestamp: new Date(),
-      sender,
-    };
-
-    setQuizMessages((prev) => [...prev, userMessage]);
-    setIsTyping(true);
-
-    try {
-      const docType = getCurrentDocTypeForChat();
-      const r = await apiChat({
-        user_id: user.email,
-        message: prompt,
-        learning_mode: "quiz",
-        language_preference: mapLanguagePref(language),
-        doc_type: docType,
-      });
-
-      const refs = (r.refs || [])
-        .map((x: any) => {
-          const a = x?.source_file ? String(x.source_file) : "";
-          const b = x?.section ? String(x.section) : "";
-          const s = `${a}${a && b ? " — " : ""}${b}`.trim();
-          return s || null;
-        })
-        .filter(Boolean) as string[];
-
-      const assistantMessage: Message = {
-        id: (Date.now() + 1).toString(),
-        role: "assistant",
-        content: r.reply || "",
-        timestamp: new Date(),
-        references: refs.length ? refs : undefined,
-        sender: spaceType === "group" ? groupMembers.find((m) => m.isAI) : undefined,
-        showNextButton: false,
-      };
-
-      setIsTyping(false);
-
-      setTimeout(() => {
-        setQuizMessages((prev) => [...prev, assistantMessage]);
-        setQuizState((prev) => ({
-          ...prev,
-          currentQuestion: prev.currentQuestion + 1,
-          waitingForAnswer: true,
-          showNextButton: false,
-        }));
-      }, 50);
-    } catch (e: any) {
-      setIsTyping(false);
-      toast.error(e?.message || "Quiz failed");
-
-      const assistantMessage: Message = {
-        id: (Date.now() + 1).toString(),
-        role: "assistant",
-        content: "Sorry — quiz request failed. Please try again.",
-        timestamp: new Date(),
-        sender: spaceType === "group" ? groupMembers.find((m) => m.isAI) : undefined,
-      };
-
-      setTimeout(() => setQuizMessages((prev) => [...prev, assistantMessage]), 50);
-    }
-  };
-
-  const handleStartQuiz = async () => {
-    if (!user) return;
-
-    setIsTyping(true);
-    try {
-      const docType = getCurrentDocTypeForChat();
-
-      const r = await apiQuizStart({
-        user_id: user.email,
-        language_preference: mapLanguagePref(language),
-        doc_type: docType,
-        learning_mode: "quiz",
-      });
-
-      const refs = (r.refs || [])
-        .map((x: any) => {
-          const a = x?.source_file ? String(x.source_file) : "";
-          const b = x?.section ? String(x.section) : "";
-          const s = `${a}${a && b ? " — " : ""}${b}`.trim();
-          return s || null;
-        })
-        .filter(Boolean) as string[];
-
-      const assistantMessage: Message = {
-        id: Date.now().toString(),
-        role: "assistant",
-        content: r.reply || "",
-        timestamp: new Date(),
-        references: refs.length ? refs : undefined,
-        sender: spaceType === "group" ? groupMembers.find((m) => m.isAI) : undefined,
-        showNextButton: false,
-      };
-
-      setIsTyping(false);
-
-      setTimeout(() => {
-        setQuizMessages((prev) => [...prev, assistantMessage]);
-        setQuizState({ currentQuestion: 0, waitingForAnswer: true, showNextButton: false });
-      }, 50);
-    } catch (e: any) {
-      setIsTyping(false);
-      toast.error(e?.message || "Start quiz failed");
-
-      const assistantMessage: Message = {
-        id: Date.now().toString(),
-        role: "assistant",
-        content: "Sorry — could not start the quiz. Please try again.",
-        timestamp: new Date(),
-        sender: spaceType === "group" ? groupMembers.find((m) => m.isAI) : undefined,
-      };
-
-      setTimeout(() => setQuizMessages((prev) => [...prev, assistantMessage]), 50);
-    }
-  };
-
-  // =========================
-  //  File Upload (FIXED)
-  // =========================
-
-  const handleFileUpload = async (input: File[] | FileList | null | undefined) => {
-    const files = Array.isArray(input) ? input : input ? Array.from(input) : [];
-    if (!files.length) return;
-
-    const newFiles: UploadedFile[] = files.map((file) => ({ file, type: "other" as FileType }));
-
-    setUploadedFiles((prev) => [...prev, ...newFiles]);
-
-    if (!user) return;
-
-    for (const f of files) {
-      const fp = `${f.name}::${f.size}::${f.lastModified}`;
-      if (uploadedFingerprintsRef.current.has(fp)) continue;
-      uploadedFingerprintsRef.current.add(fp);
-
-      try {
-        await apiUpload({
-          user_id: user.email,
-          doc_type: DOC_TYPE_MAP["other"] || "Other Course Document",
-          file: f,
-        });
-        toast.success(`File uploaded: ${f.name}`);
-      } catch (e: any) {
-        toast.error(e?.message || `Upload failed: ${f.name}`);
-        uploadedFingerprintsRef.current.delete(fp);
-      }
-    }
-  };
-
-  const handleRemoveFile = (arg: any) => {
-    setUploadedFiles((prev) => {
-      if (!prev.length) return prev;
-
-      let idx = -1;
-
-      if (typeof arg === "number") {
-        idx = arg;
-      } else {
-        const file =
-          arg?.file instanceof File
-            ? (arg as UploadedFile).file
-            : arg instanceof File
-            ? (arg as File)
-            : null;
-
-        if (file) {
-          idx = prev.findIndex(
-            (x) =>
-              x.file.name === file.name && x.file.size === file.size && x.file.lastModified === file.lastModified
-          );
-        }
-      }
-
-      if (idx < 0 || idx >= prev.length) return prev;
-
-      const removed = prev[idx]?.file;
-      const next = prev.filter((_, i) => i !== idx);
-
-      if (removed) {
-        const fp = `${removed.name}::${removed.size}::${removed.lastModified}`;
-        uploadedFingerprintsRef.current.delete(fp);
-      }
-
-      return next;
-    });
-  };
-
-  const handleFileTypeChange = async (index: number, type: FileType) => {
-    if (!user) return;
-
-    const target = uploadedFiles[index]?.file;
-    if (!target) return;
-
-    setUploadedFiles((prev) => prev.map((f, i) => (i === index ? { ...f, type } : f)));
-
-    const fp = `${target.name}::${target.size}::${target.lastModified}`;
-    if (uploadedFingerprintsRef.current.has(fp)) return;
-    uploadedFingerprintsRef.current.add(fp);
-
-    try {
-      await apiUpload({
-        user_id: user.email,
-        doc_type: DOC_TYPE_MAP[type] || "Other Course Document",
-        file: target,
-      });
-      toast.success("File uploaded to backend");
-    } catch (e: any) {
-      toast.error(e?.message || "Upload failed");
-      uploadedFingerprintsRef.current.delete(fp);
-    }
-  };
-
-  const isCurrentChatSaved = (): SavedChat | null => {
-    if (messages.length <= 1) return null;
-
-    return (
-      savedChats.find((chat) => {
-        if (chat.chatMode !== chatMode) return false;
-        if (chat.messages.length !== messages.length) return false;
-
-        return chat.messages.every((savedMsg, idx) => {
-          const currentMsg = messages[idx];
-          return savedMsg.id === currentMsg.id && savedMsg.role === currentMsg.role && savedMsg.content === currentMsg.content;
-        });
-      }) || null
-    );
-  };
-
-  const handleDeleteSavedChat = (id: string) => {
-    setSavedChats((prev) => prev.filter((chat) => chat.id !== id));
-    toast.success("Chat deleted");
-  };
-
-  const handleRenameSavedChat = (id: string, newTitle: string) => {
-    setSavedChats((prev) => prev.map((chat) => (chat.id === id ? { ...chat, title: newTitle } : chat)));
-    toast.success("Chat renamed");
-  };
-
-  const handleSaveChat = () => {
-    if (messages.length <= 1) {
-      toast.info("No conversation to save");
-      return;
-    }
-
-    const existingChat = isCurrentChatSaved();
-    if (existingChat) {
-      handleDeleteSavedChat(existingChat.id);
-      toast.success("Chat unsaved");
-      return;
-    }
-
-    const title = `Chat - ${chatMode === "ask" ? "Ask" : chatMode === "review" ? "Review" : "Quiz"} - ${new Date().toLocaleDateString()}`;
-
-    const newChat: SavedChat = {
-      id: Date.now().toString(),
-      title,
-      messages: [...messages],
-      chatMode,
-      timestamp: new Date(),
-    };
-
-    setSavedChats((prev) => [newChat, ...prev]);
-    setLeftPanelVisible(true);
-    toast.success("Chat saved!");
-  };
-
-  const handleLoadChat = (savedChat: SavedChat) => {
-    setChatMode(savedChat.chatMode);
-
-    if (savedChat.chatMode === "ask") setAskMessages(savedChat.messages);
-    else if (savedChat.chatMode === "review") setReviewMessages(savedChat.messages);
-    else {
-      setQuizMessages(savedChat.messages);
-      setQuizState({ currentQuestion: 0, waitingForAnswer: false, showNextButton: false });
-    }
-
-    toast.success("Chat loaded!");
-  };
-
-  const handleClearConversation = (shouldSave: boolean = false) => {
-    if (shouldSave) handleSaveChat();
-
-    const initialMessages: Record<ChatMode, Message[]> = {
-      ask: [
-        {
-          id: "1",
-          role: "assistant",
-          content:
-            "👋 Hi! I'm Clare, your AI teaching assistant. I'm here to help you learn through personalized tutoring. Feel free to ask me anything about the course materials, or upload your documents to get started!",
-          timestamp: new Date(),
-        },
-      ],
-      review: [
-        {
-          id: "review-1",
-          role: "assistant",
-          content:
-            "📚 Welcome to Review mode! I'll help you review and consolidate your learning. Let's go through what you've learned!",
-          timestamp: new Date(),
-        },
-      ],
-      quiz: [
-        {
-          id: "quiz-1",
-          role: "assistant",
-          content:
-            "🎯 Welcome to Quiz mode! I'll test your understanding with personalized questions based on your learning history. Ready to start?",
-          timestamp: new Date(),
-        },
-      ],
-    };
-
-    if (chatMode === "ask") setAskMessages(initialMessages.ask);
-    else if (chatMode === "review") setReviewMessages(initialMessages.review);
-    else {
-      setQuizMessages(initialMessages.quiz);
-      setQuizState({ currentQuestion: 0, waitingForAnswer: false, showNextButton: false });
-    }
-  };
-
-  const handleSave = (
-    content: string,
-    type: "export" | "quiz" | "summary",
-    saveAsChat: boolean = false,
-    format: "pdf" | "text" = "text",
-    workspaceId?: string
-  ) => {
-    if (!content.trim()) return;
-
-    if (saveAsChat && type !== "summary") {
-      const chatMessages: Message[] = [
-        {
-          id: "1",
-          role: "assistant",
-          content:
-            "👋 Hi! I'm Clare, your AI teaching assistant. I'm here to help you learn through personalized tutoring. Feel free to ask me anything about the course materials, or upload your documents to get started!",
-          timestamp: new Date(),
-        },
-        { id: Date.now().toString(), role: "assistant", content, timestamp: new Date() },
-      ];
-
-      const title = type === "export" ? "Exported Conversation" : "Micro-Quiz";
-      const newChat: SavedChat = {
-        id: Date.now().toString(),
-        title: `${title} - ${new Date().toLocaleDateString()}`,
-        messages: chatMessages,
-        chatMode: "ask",
-        timestamp: new Date(),
-      };
-
-      setSavedChats((prev) => [newChat, ...prev]);
-      setLeftPanelVisible(true);
-      toast.success("Chat saved!");
-      return;
-    }
-
-    const existingItem = savedItems.find((item) => item.content === content && item.type === type);
-    if (existingItem) {
-      handleUnsave(existingItem.id);
-      return;
-    }
-
-    const title = type === "export" ? "Exported Conversation" : type === "quiz" ? "Micro-Quiz" : "Summarization";
-    const newItem: SavedItem = {
-      id: Date.now().toString(),
-      title: `${title} - ${new Date().toLocaleDateString()}`,
-      content,
-      type,
-      timestamp: new Date(),
-      isSaved: true,
-      format,
-      workspaceId: workspaceId || currentWorkspaceId,
-    };
-
-    setSavedItems((prev) => [newItem, ...prev]);
-    setRecentlySavedId(newItem.id);
-    setLeftPanelVisible(true);
-
-    setTimeout(() => setRecentlySavedId(null), 2000);
-    toast.success("Saved for later!");
-  };
-
-  const handleUnsave = (id: string) => {
-    setSavedItems((prev) => prev.filter((item) => item.id !== id));
-    toast.success("Removed from saved items");
-  };
-
-  const handleCreateWorkspace = (payload: { name: string; category: "course" | "personal"; courseId?: string; invites: string[] }) => {
-    const id = `group-${Date.now()}`;
-    const avatar = `https://api.dicebear.com/7.x/shapes/svg?seed=${encodeURIComponent(payload.name)}`;
-
-    const creatorMember: GroupMember = user
-      ? {
-          id: user.email,
-          name: user.name,
-          email: user.email,
-          avatar: `https://api.dicebear.com/7.x/avataaars/svg?seed=${encodeURIComponent(user.email)}`,
-        }
-      : { id: "unknown", name: "Unknown", email: "unknown@email.com" };
-
-    const members: GroupMember[] = [
-      creatorMember,
-      ...payload.invites.map((email) => ({
-        id: email,
-        name: email.split("@")[0] || email,
-        email,
-      })),
-    ];
-
-    let newWorkspace: Workspace;
-
-    if (payload.category === "course") {
-      const courseInfo = availableCourses.find((c) => c.id === payload.courseId);
-      newWorkspace = {
-        id,
-        name: payload.name,
-        type: "group",
-        avatar,
-        members,
-        category: "course",
-        courseName: courseInfo?.name || "Untitled Course",
-        courseInfo,
-      };
-    } else {
-      newWorkspace = {
-        id,
-        name: payload.name,
-        type: "group",
-        avatar,
-        members,
-        category: "personal",
-        isEditable: true,
-      };
-    }
-
-    setWorkspaces((prev) => [...prev, newWorkspace]);
-    setCurrentWorkspaceId(id);
-
-    if (payload.category === "course" && payload.courseId) {
-      setCurrentCourseId(payload.courseId);
-    }
-
-    toast.success("New group workspace created");
-  };
-
-  const handleReviewClick = () => {
-    setChatMode("review");
-    setShowReviewBanner(false);
-    localStorage.setItem("reviewBannerDismissed", "true");
-  };
-
-  const handleDismissReviewBanner = () => {
-    setShowReviewBanner(false);
-    localStorage.setItem("reviewBannerDismissed", "true");
-  };
-
-  // ✅ login: hydrate profile and only show onboarding if not completed
+  // ✅ 教师专用：登录后直接进入 TeacherDashboard
   const handleLogin = (newUser: User) => {
     const hydrated = hydrateUserFromStorage(newUser);
     setUser(hydrated);
-    setShowOnboarding(!hydrated.onboardingCompleted);
-  };
-
-  const handleOnboardingComplete = (updatedUser: User) => {
-    handleUserSave({ ...updatedUser, onboardingCompleted: true });
-    setShowOnboarding(false);
-  };
-
-  const handleOnboardingSkip = () => {
-    updateUser({ onboardingCompleted: true });
-    setShowOnboarding(false);
   };
 
   if (!user) return <LoginScreen onLogin={handleLogin} />;
 
-  if (showOnboarding && user)
-    return <Onboarding user={user} onComplete={handleOnboardingComplete} onSkip={handleOnboardingSkip} />;
-
+  // ✅ 教师专用：只显示 TeacherDashboard，移除所有学生界面
   return (
     <div className="fixed inset-0 w-full bg-background overflow-hidden">
       <Toaster />
-
-      <div className="flex h-full min-h-0 min-w-0 flex-col overflow-hidden">
-        <div className="flex-shrink-0">
-          <Header
-            user={user}
-            onMenuClick={() => setLeftSidebarOpen(!leftSidebarOpen)}
-            onUserClick={() => setShowProfileEditor(true)}
-            isDarkMode={isDarkMode}
-            onToggleDarkMode={() => setIsDarkMode(!isDarkMode)}
-            language={language}
-            onLanguageChange={setLanguage}
-            workspaces={workspaces}
-            currentWorkspace={currentWorkspace}
-            onWorkspaceChange={setCurrentWorkspaceId}
-            onCreateWorkspace={handleCreateWorkspace}
-            onLogout={() => setUser(null)}
-            availableCourses={availableCourses}
-            onUserUpdate={handleUserSave}
-            reviewStarOpacity={reviewStarOpacity}
-            reviewEnergyPct={reviewEnergyPct}
-            onStarClick={() => {
-              setChatMode("review");
-              setShowReviewBanner(false);
-              localStorage.setItem("reviewBannerDismissed", "true");
-            }}
-            showTeacherView={showTeacherDashboard}
-            onShowTeacherDashboard={() => setShowTeacherDashboard(true)}
-            onBackFromTeacher={() => setShowTeacherDashboard(false)}
-          />
-        </div>
-
-        {showProfileEditor && user && (
-          <ProfileEditor user={user} onSave={handleUserSave} onClose={() => setShowProfileEditor(false)} />
-        )}
-
-        {showReviewBanner && (
-          <div className="flex-shrink-0 w-full bg-background border-b border-border relative z-50">
-            <ReviewBanner onReview={handleReviewClick} onDismiss={handleDismissReviewBanner} />
-          </div>
-        )}
-
-        <div className="flex flex-1 min-h-0 min-w-0 overflow-hidden relative">
-          {!leftPanelVisible && (
-            <Button
-              variant="secondary"
-              size="icon"
-              onClick={() => setLeftPanelVisible(true)}
-              className="hidden lg:flex absolute z-[100] h-8 w-5 shadow-lg rounded-full bg-card border border-border transition-all duration-200 ease-in-out hover:translate-x-[10px]"
-              style={{ left: "-5px", top: "1rem" }}
-              title="Open panel"
-            >
-              <ChevronRight className="h-3 w-3" />
-            </Button>
-          )}
-
-          {leftSidebarOpen && (
-            <div className="fixed inset-0 bg-black/50 z-40 lg:hidden" onClick={() => setLeftSidebarOpen(false)} />
-          )}
-
-          {leftPanelVisible ? (
-            <aside className="hidden lg:flex w-80 h-full min-h-0 min-w-0 bg-card border-r border-border overflow-hidden relative flex-col">
-              <Button
-                variant="secondary"
-                size="icon"
-                onClick={() => setLeftPanelVisible(false)}
-                className="absolute z-[70] h-8 w-5 shadow-lg rounded-full bg-card border border-border"
-                style={{ right: "-10px", top: "1rem" }}
-                title="Close panel"
-              >
-                <ChevronLeft className="h-3 w-3" />
-              </Button>
-
-              <div className="flex-1 min-h-0 min-w-0 overflow-hidden">
-                <LeftSidebar
-                  learningMode={learningMode}
-                  language={language}
-                  onLearningModeChange={setLearningMode}
-                  onLanguageChange={setLanguage}
-                  spaceType={sidebarSpaceType}
-                  groupMembers={sidebarGroupMembers}
-                  user={user}
-                  onLogin={setUser}
-                  onLogout={() => setUser(null)}
-                  isLoggedIn={!!user}
-                  onEditProfile={() => setShowProfileEditor(true)}
-                  savedItems={savedItems}
-                  recentlySavedId={recentlySavedId}
-                  onUnsave={handleUnsave}
-                  onSave={handleSave}
-                  savedChats={savedChats}
-                  onLoadChat={handleLoadChat}
-                  onDeleteSavedChat={handleDeleteSavedChat}
-                  onRenameSavedChat={handleRenameSavedChat}
-                  currentWorkspaceId={currentWorkspaceId}
-                  workspaces={sidebarWorkspaces}
-                  selectedCourse={currentCourseId}
-                  availableCourses={availableCourses}
-                />
-              </div>
-            </aside>
-          ) : null}
-
-          <aside
-            className={[
-              "fixed lg:hidden z-50",
-              "left-0 top-0 bottom-0",
-              "w-80 bg-card border-r border-border",
-              "transform transition-transform duration-300 ease-in-out",
-              leftSidebarOpen ? "translate-x-0" : "-translate-x-full",
-              "overflow-hidden flex flex-col",
-            ].join(" ")}
-          >
-            <div className="p-4 border-b border-border flex justify-between items-center flex-shrink-0">
-              <h3>Settings & Guide</h3>
-              <Button variant="ghost" size="icon" onClick={() => setLeftSidebarOpen(false)}>
-                <X className="h-5 w-5" />
-              </Button>
-            </div>
-
-            <div className="flex-1 min-h-0 overflow-hidden">
-              <LeftSidebar
-                learningMode={learningMode}
-                language={language}
-                onLearningModeChange={setLearningMode}
-                onLanguageChange={setLanguage}
-                spaceType={sidebarSpaceType}
-                groupMembers={sidebarGroupMembers}
-                user={user}
-                onLogin={setUser}
-                onLogout={() => setUser(null)}
-                isLoggedIn={!!user}
-                onEditProfile={() => setShowProfileEditor(true)}
-                savedItems={savedItems}
-                recentlySavedId={recentlySavedId}
-                onUnsave={handleUnsave}
-                onSave={handleSave}
-                savedChats={savedChats}
-                onLoadChat={handleLoadChat}
-                onDeleteSavedChat={handleDeleteSavedChat}
-                onRenameSavedChat={handleRenameSavedChat}
-                currentWorkspaceId={currentWorkspaceId}
-                workspaces={sidebarWorkspaces}
-                selectedCourse={currentCourseId}
-                availableCourses={availableCourses}
-              />
-            </div>
-          </aside>
-
-          <main className="flex flex-1 min-w-0 min-h-0 overflow-hidden flex-col">
-            <div className="flex-1 min-h-0 min-w-0 overflow-hidden">
-              {showTeacherDashboard ? (
-                <TeacherDashboard onBack={() => setShowTeacherDashboard(false)} />
-              ) : (
-              <ChatArea
-                messages={messages}
-                onSendMessage={handleSendMessage}
-                uploadedFiles={uploadedFiles}
-                onFileUpload={handleFileUpload}
-                onRemoveFile={handleRemoveFile}
-                onFileTypeChange={handleFileTypeChange}
-                memoryProgress={memoryProgress}
-                isLoggedIn={!!user}
-                learningMode={learningMode}
-                onClearConversation={() => setShowClearDialog(true)}
-                onSaveChat={handleSaveChat}
-                onLearningModeChange={setLearningMode}
-                spaceType={spaceType}
-                chatMode={chatMode}
-                onChatModeChange={setChatMode}
-                onNextQuestion={handleNextQuestion}
-                onStartQuiz={handleStartQuiz}
-                quizState={quizState}
-                isTyping={isTyping}
-                showClearDialog={showClearDialog}
-                onConfirmClear={(shouldSave) => {
-                  handleClearConversation(shouldSave);
-                  setShowClearDialog(false);
-                }}
-                onCancelClear={() => setShowClearDialog(false)}
-                savedChats={savedChats}
-                workspaces={workspaces}
-                currentWorkspaceId={currentWorkspaceId}
-                onSaveFile={(content, type, _format, targetWorkspaceId) =>
-                  handleSave(content, type, false, (_format ?? "text") as "pdf" | "text", targetWorkspaceId)
-                }
-                leftPanelVisible={leftPanelVisible}
-                currentCourseId={currentCourseId}
-                onCourseChange={handleCourseChange}
-                availableCourses={availableCourses}
-                showReviewBanner={showReviewBanner}
-                onReviewActivity={handleReviewActivity}
-                currentUserId={user?.email}
-                docType={"Syllabus"}
-                // ✅ bio is still allowed to be updated by chat/Clare
-                onProfileBioUpdate={(bio) => updateUser({ bio })}
-              />
-              )}
-            </div>
-          </main>
-        </div>
-      </div>
+      <TeacherDashboard onBack={() => setUser(null)} />
     </div>
   );
 }

web/src/components/LoginScreen.tsx

@@ -57,9 +57,9 @@ export function LoginScreen({ onLogin }: LoginScreenProps) {
           </div>
 
           <div className="text-center space-y-2">
-            <h1 className="text-2xl">Welcome to Clare</h1>
+            <h1 className="text-2xl">ClareCourseWare</h1>
             <p className="text-sm text-muted-foreground">
-              Your AI teaching assistant for personalized learning
+              AI 智能建课助手 - 教师专用
             </p>
           </div>
 
@@ -82,13 +82,13 @@ export function LoginScreen({ onLogin }: LoginScreenProps) {
               </div>
 
               <div className="space-y-2">
-                <Label htmlFor="login-email">Email / Student ID</Label>
+                <Label htmlFor="login-email">Email / 教师 ID</Label>
                 <Input
                   id="login-email"
                   type="email"
                   value={email}
                   onChange={(e) => setEmail(e.target.value)}
-                  placeholder="Enter your email or ID"
+                  placeholder="Enter your email or teacher ID"
                   required
                   disabled={submitting}
                 />

web/src/components/TeacherDashboard.tsx

@@ -7,7 +7,7 @@ import { Input } from "./ui/input";
 import { Textarea } from "./ui/textarea";
 import { Label } from "./ui/label";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "./ui/select";
-import { ArrowLeft, Loader2, Lightbulb, FileText, ClipboardList, BarChart3, Target, CalendarDays, MessageSquare, TrendingUp, BookOpen, Languages } from "lucide-react";
+import { Loader2, Lightbulb, FileText, ClipboardList, BarChart3, Target, CalendarDays, MessageSquare, TrendingUp, BookOpen, Languages } from "lucide-react";
 import {
   apiTeacherStatus,
   apiTeacherCourseDescription,
@@ -372,11 +372,8 @@ export function TeacherDashboard({ onBack }: Props) {
   return (
     <div className="h-full flex flex-col bg-background">
       <div className="flex-shrink-0 flex items-center gap-4 px-4 py-3 border-b border-border">
-        <Button variant="ghost" size="icon" onClick={onBack} title="返回">
-          <ArrowLeft className="h-5 w-5" />
-        </Button>
         <div>
-          <h1 className="text-lg font-semibold">AI 智能建课</h1>
+          <h1 className="text-lg font-semibold">ClareCourseWare - AI 智能建课</h1>
           <p className="text-sm text-muted-foreground">
             共 9 项功能 · 基于 GENAI 课程知识库
             {status?.weaviate_configured && (
@@ -396,6 +393,9 @@ export function TeacherDashboard({ onBack }: Props) {
               <SelectItem value="auto">跟随输入</SelectItem>
             </SelectContent>
           </Select>
+          <Button variant="ghost" size="sm" onClick={onBack} className="ml-2">
+            登出
+          </Button>
         </div>
       </div>